c5ffbb0241
AC_PROG_YACC: don't force Bison to warn against its own features. Requested by: ler (via email) Reference: https://github.com/paul-j-lucas/cdecl/issues/2
53 lines
2.3 KiB
Text
53 lines
2.3 KiB
Text
From 42761668c0300afa7f8bf5ba736458a818cd5d15 Mon Sep 17 00:00:00 2001
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From: Akim Demaille <akim@lrde.epita.fr>
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Date: Tue, 19 Mar 2013 11:19:17 -0700
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Subject: AC_PROG_YACC: don't force Bison to warn against its own features
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When invoked with -y/--yacc, Bison warns when its extensions over
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POSIX Yacc are used. Yet many packages requiring GNU Bison use
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Autoconf/Automake's Yacc support, which passes -y to Bison. It
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turns out that passing '-o y.tab.c' has exactly the desired
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effect: generating not only y.tab.c but also y.tab.h with -d and
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y.output with -v. See:
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http://lists.gnu.org/archive/html/bison-patches/2013-02/msg00100.html
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* lib/autoconf/programs.m4 (AC_PROG_YACC): Use bison -o y.tab.c.
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* NEWS, doc/autoconf.texi: Document this change.
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---
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NEWS | 4 ++++
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doc/autoconf.texi | 2 +-
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lib/autoconf/programs.m4 | 4 ++--
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3 files changed, 7 insertions(+), 3 deletions(-)
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diff --git a/doc/autoconf.texi b/doc/autoconf.texi
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index c54c5b3..f895e47 100644
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--- doc/autoconf.texi
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+++ doc/autoconf.texi
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@@ -4222,7 +4222,7 @@ and is cached in the @code{ac_cv_path_SED} variable.
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@ovindex YACC
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@caindex prog_YACC
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If @code{bison} is found, set output variable @code{YACC} to @samp{bison
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--y}. Otherwise, if @code{byacc} is found, set @code{YACC} to
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+-o y.tab.c}. Otherwise, if @code{byacc} is found, set @code{YACC} to
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@samp{byacc}. Otherwise set @code{YACC} to @samp{yacc}.
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The result of this test can be influenced by setting the variable
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@code{YACC} or the cache variable @code{ac_cv_prog_YACC}.
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diff --git a/lib/autoconf/programs.m4 b/lib/autoconf/programs.m4
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index f7af8b5..2057e78 100644
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--- lib/autoconf/programs.m4
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+++ lib/autoconf/programs.m4
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@@ -892,10 +892,10 @@ AN_PROGRAM([yacc], [AC_PROG_YACC])
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AN_PROGRAM([byacc], [AC_PROG_YACC])
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AN_PROGRAM([bison], [AC_PROG_YACC])
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AC_DEFUN([AC_PROG_YACC],
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-[AC_CHECK_PROGS(YACC, 'bison -y' byacc, yacc)dnl
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+[AC_CHECK_PROGS(YACC, 'bison -o y.tab.c' byacc, yacc)dnl
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AC_ARG_VAR(YACC,
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[The `Yet Another Compiler Compiler' implementation to use. Defaults to
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-the first program found out of: `bison -y', `byacc', `yacc'.])dnl
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+the first program found out of: `bison -o y.tab.c', `byacc', `yacc'.])dnl
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AC_ARG_VAR(YFLAGS,
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[The list of arguments that will be passed by default to $YACC. This script
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will default YFLAGS to the empty string to avoid a default value of `-d' given
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--
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cgit v1.0-41-gc330
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